fix issue 13821 again

[rainers]

This should fix the CI breakage, redoing #2801.

[dlang-bot]

Thanks for your pull request, @rainers!

Bugzilla references

Auto-close	Bugzilla	Severity	Description
✓	13821	blocker	fiber + exception + win server 2012 failures

Testing this PR locally

If you don't have a local development environment setup, you can use Digger to test this PR:

dub fetch digger
dub run digger -- build "master + druntime#2823"

[rainers]

I have currently no idea why this still fails (it works in a Windows Server VM locally). So maybe reverting with #2822 could fix the builds sooner.

[rainers]

I finally figured the problem:

• druntime is checked out into a folder "s", not "druntime" as for example AppVeyor does.
• the build script clones dmd into "../dmd"
• dmd's installation/build script windows-visual-studio.sh/windows.sh is invoked
• as no folder "../druntime" exists druntime/master is checked out
• dmd's build and tests are run

So, the azure tests never actually tested the PR, but always master (or stable).

This should be fixed now by copying the source folder to "../druntime". There is still a wrong message [GIT_CLONE] Switched druntime to branch master in the log, but that has to be fixed in dmd's repo.

[thewilsonator]

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